4346770 A/C Idler Pulley for HITACHI EX120-5 EX200-5 ZX200

4346770 A/C Idler Pulley

4346770 is an idler pulley used in the air-conditioning belt drive on selected Hitachi EX and ZX series excavators. The pulley guides the V-belt and works with the threaded adjustment arrangement to maintain the correct belt position and operating tension.

This component is also commonly described as an A/C belt tensioner pulley. It should be identified by the 4346770 part number, pulley construction and mounting configuration rather than by excavator model alone, because the same basic excavator family can use different air-conditioning arrangements.

Pulley and Adjustment Inspection

Before replacement, rotate the pulley by hand and check the bearing for roughness, looseness or abnormal noise. Inspect the V-groove for uneven wear, corrosion and belt contact damage, and check that the threaded adjustment hardware moves correctly without excessive play.

A worn idler pulley can cause belt vibration, misalignment, noise or premature belt wear. The A/C belt and surrounding mounting brackets should therefore be inspected at the same time.

Hitachi EX and ZAXIS Excavator Fitment

4346770 is used in the air-conditioning belt drive on a wide range of Hitachi EX and ZAXIS excavators. Confirmed EX-series applications include EX80-5, EX100M-5, EX120-5, EX160LC-5 and EX200LC-5.

Confirmed ZAXIS applications include selected models in the ZAXIS75, ZAXIS85, ZAXIS120, ZAXIS130, ZAXIS135, ZAXIS160, ZAXIS180, ZAXIS190, ZAXIS200, ZAXIS210, ZAXIS225, ZAXIS230, ZAXIS240, ZAXIS245, ZAXIS250, ZAXIS260, ZAXIS270, ZAXIS290, ZAXIS300, ZAXIS310, ZAXIS330, ZAXIS345, ZAXIS350, ZAXIS370 and ZAXIS380 families.

Specific catalog applications include ZAXIS120-3, ZAXIS130-5G, ZAXIS135US-3, ZAXIS160LC-3, ZAXIS190W-3, ZAXIS200LC-3, ZAXIS210LC-5G, ZAXIS225USLC-3, ZAXIS240LC-3, ZAXIS245USLC-5N, ZAXIS250LC-5G, ZAXIS270LC-3, ZAXIS290LC-5N, ZAXIS350LC-5G and ZAXIS380LC-6N, together with other related regional configurations.

Because 4346770 is used across several machine generations and regional configurations, confirm the original 4346770 or AT213915 number together with the excavator model and serial number before ordering.

Topvelsun Pulley Supply Support

Topvelsun supplies excavator A/C idler pulleys, belt tensioner pulleys and related belt-drive components with 1-piece MOQ and a 6-month warranty. Send the OEM number, machine information and original part photos for fitment confirmation before ordering.